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A kind of LED red fluorescent powder and preparation method thereof

A red phosphor, 2x-yyysi1-xn3 technology, applied in the field of phosphor, can solve the problems of low luminous intensity of phosphor, harsh equipment requirements, complicated process, etc., and achieve improved luminous performance, stable crystal structure, and high luminous efficiency Effect

Active Publication Date: 2015-09-23
JIANGSU BREE OPTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned existing patents all adopt stoichiometric ratio for sintering, and adopt high temperature and high pressure one-step synthesis method to prepare phosphor. And other issues

Method used

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  • A kind of LED red fluorescent powder and preparation method thereof
  • A kind of LED red fluorescent powder and preparation method thereof
  • A kind of LED red fluorescent powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh Ca 3 N 2 6.147g, AlN6.552g, Y 2 o 3 1.329g, Si 3 N 4 5.849g, Eu 2 o 3 0.122g, the above raw materials were fully mixed in a nitrogen atmosphere for 1h, put into a molybdenum crucible, and then quickly moved into a tube furnace, and then gradually heated up to 700 under the protection of high-purity nitrogen (nitrogen atmosphere pressure is normal pressure) ℃, keep warm for 3h; then raise the temperature to 1600°C, keep warm for 12h, grind the obtained material, sieve, wash with water until the conductivity is 9.12μs / cm, and finally dry at 90°C to obtain Ca 0.895 Al 1.15 Y 0.05 Si 0.9 N 3 : 0.005Eu LED red phosphor. Its XRD pattern is shown in figure 1 , the emission spectrum see figure 2 , the excitation spectrum is shown in image 3 ; Its luminous intensity is shown in Table 1, which is higher than Comparative Example 1.

Embodiment 2

[0037] Weigh Ca 3 N 2 7.69g, AlN4.602g, Y 2 o 3 0.272g, Si 3 N 4 7.311g, Eu 2 o 30.125g, mix the above raw materials in a nitrogen atmosphere for 1h, put them into a molybdenum crucible, then quickly move them into a tube furnace, and then gradually raise the temperature to 700 ℃, keep warm for 3h; then raise the temperature to 1600°C, keep warm for 12h, grind the obtained material, sieve, wash with water until the conductivity is 9.12μs / cm, and finally dry at 90°C to obtain Ca 1.095 al 079 Y 0.01 Si 1.1 N 3 : 0.005Eu LED red phosphor. Its XRD pattern is shown in figure 1 , the emission spectrum see figure 2 , the excitation spectrum is shown in image 3 ; Its luminous intensity is shown in Table 1, which is higher than Comparative Example 1.

Embodiment 3

[0044] Weigh Ca 3 N 2 5.247g, Sr 3 N 2 0.48g, AlN4.352g, Y 2 o 3 4.513g, Si 3 N 4 5.241g, Eu 2 o 3 0.166g, the above raw materials are fully mixed in nitrogen atmosphere for 2 hours, put into molybdenum crucible, and then quickly moved into the tube furnace, and then in the protection of high-purity nitrogen-hydrogen mixed atmosphere (nitrogen-hydrogen mixed atmosphere pressure is normal pressure) Gradually raise the temperature to 900°C and keep it warm for 4 hours; then raise the temperature to 1630°C and keep it warm for 10 hours, grind the obtained material and sieve it, wash it with water until the conductivity is 7.65μs / cm, and finally dry it at 90°C, that is Can produce Ca 0.9 Sr 0.042 al 0.9 Y 0.2 Si 0.95 N 3 : 0.008Eu LED red phosphor. Its luminous intensity is shown in Table 2, which is higher than that of Comparative Example 2.

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Abstract

The invention relates to LED red fluorescent powder which has a chemical structure formula as follows: M[1-x-z]Al[1+2x-y]Y[y]Si[1-x]N3 : Eu[z] (1), wherein M is selected from at least one or mixture of more than two of Ca, Sr and Ba in any proportion; x is not less than -0.2 and not more than 0.2 and is not equal to 0, y is not less than 0.001 and not more than 0.2, and z is not less than 0.001 and not more than 0.1. The invention further relates to a preparation method of the LED red fluorescent powder. According to the method, the deficient or excess treatment of elements and the dosage linkage of different elements are adopted, so that the charge balance of the chemical formula is ensured on the premise of not changing the crystal structure, and the luminous intensity of the fluorescent powder is effectively improved; and a doping Y element is adopted for optimizing and adjusting a crystal field of the fluorescent powder, so that the luminous intensity of the fluorescent powder is remarkably improved.

Description

technical field [0001] The invention relates to a fluorescent powder, in particular to an LED red fluorescent powder which can be effectively excited by ultraviolet light, purple light or blue light and a preparation method thereof. Background technique [0002] In recent years, with the gradual improvement of light-emitting diode (LED) luminous efficiency and the gradual decrease of cost, semiconductor lighting has gradually become the development trend of modern lighting. White light LED has many special advantages incomparable to other light sources, such as low power consumption, long life, and environmental protection. light source". [0003] In order to realize the entry of semiconductor lighting into the field of general lighting, efficient white LEDs must be obtained. There are many ways to realize semiconductor lighting. At present, the most mature technical solution is to apply YAG yellow phosphor on the blue LED chip, but this solution has disadvantages such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80
Inventor 何锦华滕晓明梁超符义兵刘凯
Owner JIANGSU BREE OPTRONICS CO LTD